Tetra Tech director files initial Form 3

TETRA TECH INC director Eric W. Thornburg has filed a Form 3, the initial statement of beneficial ownership required for new insiders.

Rhea-AI Filing Summary

TETRA TECH INC director Eric W. Thornburg has filed a Form 3, the initial statement of beneficial ownership required for new insiders. The filing lists no reportable transactions, and no derivative positions are shown in the derivative summary or transaction summary.

Key Terms

Form 3, reportingPersons, transactionSummary

3 terms

Form 3 regulatory

"INSIDER FILING DATA (Form 3)"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

reportingPersons regulatory

""reportingPersons": ["

transactionSummary financial

""transactionSummary": {"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does TTEK's Form 3 filing for Eric W. Thornburg show?

The Form 3 for Eric W. Thornburg at TTEK is an initial insider ownership report. It shows no reported purchases, sales, or derivative transactions and includes no holding entries in the transaction or derivative summaries.

Did Eric W. Thornburg buy or sell TTEK shares in this Form 3?

No transactions are reported for Eric W. Thornburg in this Form 3. The transaction summary shows zero buys, zero sells, and no derivative exercises, gifts, or tax-withholding events disclosed in this filing.

What is the role of Eric W. Thornburg at Tetra Tech (TTEK)?

Eric W. Thornburg is identified as a director of TETRA TECH INC in the Form 3. The filing marks him as a director, not an officer or 10% owner, establishing his status as a reporting person under insider ownership rules.

Does TTEK's Form 3 for Eric W. Thornburg list any derivative securities?

The Form 3 derivative summary for Eric W. Thornburg at TTEK is empty. It shows no derivative positions such as options or warrants, and the derivativeTransactionCount is reported as zero in the transaction summary.

What does the transactionSummary indicate in the TTEK Form 3 filing?

The transactionSummary in this TTEK Form 3 shows zero buy, sell, acquire, dispose, or other transactions. It also reports zero exercise, gift, tax-withholding, and restructuring events, with a neutral netBuySellDirection and no net change in shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/03/2026 - 07:05 PM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Thornburg Eric W

(Last) (First) (Middle)

3475 E. FOOTHILL BLVD

(Street)

PASADENA CALIFORNIA 91107

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/30/2026

3. Issuer Name and Ticker or Trading Symbol
TETRA TECH INC [ TTEK ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

No securities are beneficially owned.

	/s/ Preston Hopson, Attorney-in-fact for Eric W. Thornburg	04/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)